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改进型新安江模型利用双抛物线型曲线来描述流域土壤蓄水容量的空间分布及进行产流计算.双抛物线型曲线有一种内在结构,能够利用同一组参数对流域空间上同时存在的多种土壤水分模式进行描述.然而,这一曲线为统计积分表达式,需要利用流域降雨径流观测资料通过最优率定来确定.传统的TOPMODEL模型利用湿润指数或土壤-地形指数,对流域内每一点的土壤水分进行预测.然而,TOPMODEL模型假定整个流域处于稳定状态,且地下水位与地面平行.这种简化处理使得TOPMODEL模型并不适用于流域每一点.本文结合新安江模型双抛物线型曲线和TOPMODEL模型湿度指数,充分利用流域降雨径流观测资料和分布式地形数据,对不同的土壤水分模式在广东省珠江三角洲双桥流域空间上的分布进行了确定,研究得出了该流域划分TOPMODEL模型适用范围的湿度指数临界值.
The improved Xin’anjiang model uses the dual-parabolic curve to describe the spatial distribution of soil water storage capacity and calculate the runoff production.The double parabolic curve has an intrinsic structure that can use the same set of parameters to simulate the simultaneous presence of multiple soils However, this curve is the statistical integral expression, which needs to be determined by the optimal rate using the rainfall runoff observation data.The traditional TOPMODEL model uses the wetness index or the soil-topography index to calculate the integral of each point in the basin However, the TOPMODEL model assumes that the whole basin is stable and the groundwater level is parallel to the ground.This simplification makes the TOPMODEL model unsuitable for every point of the basin.According to the double-parabolic curves of Xin’anjiang model and TOPMODEL model Humidity index, make full use of rainfall and runoff observation data and distributed topographic data to determine the spatial distribution of different soil moisture patterns in the Shuangqiao watershed in the Pearl River Delta of Guangdong Province, and draw the conclusion that the scope of TOPMODEL model Humidity index critical value.